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Joseph Priestley, who discovered oxygen warned against overconsumption of the gas, lest it shorten ones life

Sir, Warnings against the intemperate use of oxygen are not new (“Why
you should avoid superfoods, placentas – and celebrity science tips”,
report, Dec 28). Joseph Priestley, who is generally considered to be the
discoverer of this gas and who named it dephlogisticated air, noticed that
it enhanced the burning of a candle. Perceiving a connection between
combustion and breathing, he may have anticipated its later use in medicine.
Thus he wrote in 1776: “From the greater strength and vivacity of the flame
of a candle, in this pure air, it may be conjectured, that it might be
peculiarly salutary

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